extension
ex·ten·sion/ɪkˈstɛnʃən/noun
extension is spelled E-X-T-E-N-S-I-O-N, 3 syllables: ex·ten·sion. The wrong spelling people search most is extention: about 1,600 Bing searches a month in the United States (September 2025 to August 2026), about 1 in 10 of all searches for the word. Extension is a noun meaning “The act of extending; a stretching out; enlargement in length, breadth, or time; an increase”. The plural of extension is extensions.
How many letters and syllables are in extension?
| Letters | 9: E-X-T-E-N-S-I-O-N |
|---|---|
| Syllables | 3: ex·ten·sion |
| In writing | 29 times per million words; the 3,218th most frequent word form |
| Wrong spellings searched | 1; the most searched, extention, about 1,600 Bing searches a month (all of them) |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); Bing searches in the United States: the average month from September 2025 to August 2026 (Microsoft Advertising keyword data through DataForSEO, read September 30, 2026).
How do you spell extension?
Extension is spelled E-X-T-E-N-S-I-O-N. One wrong spelling is searched or written often enough to measure; together they are about 1 in 10 of the searches for extension in either form.
Bing searches in the United States: the average month from September 2025 to August 2026 (Microsoft Advertising keyword data through DataForSEO, read September 30, 2026). Wrong spellings are taken from Wiktionary entries tagged "misspelling" and its obsolete or nonstandard forms, Wikipedia's Lists of common misspellings and the codespell dictionary, then measured. The proofreader's marks show the change that corrects each one.
How common is extension?
Extension appears 29 times per million words in written English, the 3,218th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce extension?
- /ɪkˈstɛnʃən/
- /ɛkˈstɛnʃən/
Extension has 3 syllables, split ex·ten·sion in writing.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: En-us-extension.ogg, Wikimedia Commons (author and licence on each file's page).
Forms of extension
- extensions plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does extension mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
The act of extending; a stretching out; enlargement in length, breadth, or time; an increase.
Next month the house is undergoing an extension.
- 2
The state of being extended.
- 3
That property of a body by which it occupies a portion of space (or time, e.g. "spatiotemporal extension").
- 4
A short exact sequence 1→H→E→G→1, or the group E therein.
- 5
A short exact sequence 0→B→E→A→0, or the object E therein.
- 6
A part of a building that has been added onto the original.
- 7
An outgrowth; a part of something that extends its capabilities.
Parents who treat their children as an extension of themselves
- 8
Capacity of a concept or general term to include a greater or smaller number of objects; – correlative of intension.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How do you abbreviate extension?
Wiktionary records one abbreviation of extension: ext..
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Extension in Spanish, French, German and Portuguese
| Language | Words |
|---|---|
| French | extension |
| German | Ausdehnung, Erweiterung , Bedeutungserweiterung , Verlängerung |
| Portuguese | extensão |
| Spanish | extensión, extendimiento |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does extension come from?
From Middle English extensioun, from Old French estension, from Latin extensiō, extensiōnem.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).